HD 27022

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HD 27022
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Camelopardalis
Right ascension 04h 20m 40.3250s[1]
Declination +65° 08′ 25.5919″[1]
Apparent magnitude (V) +5.27[2]
Characteristics
Spectral type G4 III[3] or G5 IIb[4]
U−B color index +0.47[2]
B−V color index +0.81[2]
Astrometry
Radial velocity (Rv)–19.57[1] km/s
Proper motion (μ) RA: –28.167[1] mas/yr
Dec.: –4.652[1] mas/yr
Parallax (π)9.4908 ± 0.0960[1] mas
Distance344 ± 3 ly
(105 ± 1 pc)
Absolute magnitude (MV)+0.15
Details
Mass2.64[5] M☉
Radius10.71+0.23
−1.06[1] R☉
Luminosity75.9[5] L☉
Surface gravity (log g)3.10±0.21[6] cgs
Temperature5,211±57 K
Metallicity [Fe/H]0.03±0.05[6] dex
Rotational velocity (v sin i)<1[7] km/s
Age500[5] Myr
Other designations
BD+64°433, HD 27022, HIP 20266, HR 1327, SAO 13098
Database references
SIMBADdata

HD 27022 (HR 1327) is a solitary star in the circumpolar constellation Camelopardalis. With an apparent magnitude of 5.27,[2] it's faintly visible to the naked eye under ideal conditions. This star is located at a distance of 344 light years,[1] but is drifting closer at a rate of 19.57 km/s.[1]

HD 27022 has a classification of either G4 III[3] or G5 IIb.[4] Both states that it's an evolved G-type star, but one classification says that HD 27022 is a bright giant with weak lines. At present it has 2.64 times the mass of the Sun,[5] but at an age of 500 million years,[5] HD 27022 has expanded to 10.71 times its girth. It radiates at 75.9 times the luminosity of the Sun[5] from its enlarged photosphere at an effective temperature of 5,211 K,[5] which gives it a yellow hue. HD 27022 spins slowly with a projected rotational velocity less than 1 km/s,[7] common for giants, and is believed to be a stream member of the Ursa Major Moving Group.

References[]

  1. ^ a b c d e f g h i Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR Online Data Catalog. Bibcode:2002yCat.2237....0D.
  3. ^ a b Keenan, Philip C.; McNeil, Raymond C. (October 1989). "The Perkins Catalog of Revised MK Types for the Cooler Stars". The Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373. ISSN 0067-0049.
  4. ^ a b Keenan, P. C.; Pitts, R. E. (April 1980). "Revised MK spectral types for G, K ANS M stars". The Astrophysical Journal Supplement Series. 42: 541–563. Bibcode:1980ApJS...42..541K. doi:10.1086/190662. ISSN 0067-0049.
  5. ^ a b c d e f g Luck, R. Earle (September 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. ISSN 0004-6256.
  6. ^ a b da Silva, Ronaldo; Milone, André de C.; Rocha-Pinto, Helio J. (August 2015). "Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets". Astronomy and Astrophysics. 580: A24. Bibcode:2015A&A...580A..24D. doi:10.1051/0004-6361/201525770. ISSN 0004-6361.
  7. ^ a b de Medeiros, J. R.; Mayor, M. (November 1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433–460. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. ISSN 0365-0138.
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